Filling the gap: new precise Early Cretaceous radioisotopic ages from the Andes

Two tuffs in the Lower Cretaceous Agrio Formation, Neuquén Basin, provided U–Pb zircon radioisotopic ages of 129.09±0.16 Ma and 127.42±0.15 Ma. Both horizons are well constrained biostratigraphically by ammonites and nannofossils and can be correlated with the ‘standard’ sequence of the Mediterranean Province. The lower horizon is very close to the base of the Upper Hauterivian and the upper horizon to the Hauterivian/Barremian boundary, indicating that the former lies at c. 129.5 Ma and the latter at c. 127 Ma. These new radioisotopic ages fill a gap of over 8 million years in the numerical calibration of the current global Early Cretaceous geological time scale.

Palabras clave: Bioestratigraphy , Ammonoids , Upb Ca-Id-Tims , Calcareous Nannofossils

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Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)

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URI: http://hdl.handle.net/11336/18522

DOI: http://dx.doi.org/10.1017/S001675681400082X

URL: https://www.cambridge.org/core/journals/geological-magazine/article/filling-the-

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Articulos(IDEAN)
Articulos de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"

Citación

Aguirre-Urreta, Maria Beatriz; Lescano, Marina Aurora; Schmitz, Mark; Tunik, Maisa Andrea; Concheyro, Graciela; et al.; Filling the gap: new precise Early Cretaceous radioisotopic ages from the Andes; Cambridge University Press; Geological Magazine; 152; 3; 5-2015; 557-564

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